YappyGrow a mattress is specially developed to be suitable not only for the 1.5-year-old child, but also the 18-year-old teenager. The mattress of YappyGrow consists of 2 parts. One part 140kh70sm, and other part 50kh70sm. In the lower and top part a coconut plate, in the middle special foam rubber which after a diformation very quickly takes the initial form. Height of an aatras is 11 cm. The mattress is made without glue use. The stuffing is wrapped in a cover from a hlopok (90%) and wool (10%).